Re: What are the official uses of bitcoin other then trading?

Of course, in addition to its investment value, Bitcoin is seen as a currency, and its characteristics are decentralized and anonymous.
There are many companies that accept bitcoin for payments like Amazon and Tesla, so people can't deny that Bitcoin is still a currency.

There are so many merchants now accepting bitcoin other than Amazon and Tesla.

This article give the top 11 major companies that are accepting bitcoin - https://www.buybitcoinworldwide.com/who-accepts-bitcoin/

Microsoft, Overstock, Home Depot, Namecheap, Starbucks, Whole Foods, NewEgg, Lolli, FoldApp, Purse.io, CoinCards

Those are just the major companies, there are also smaller merchants that are now accepting btc. So it is not for trading or investment purposes only but you can very well use them in a lot of merchants.

You can also check this one out - https://99bitcoins.com/bitcoin/who-accepts/

So I can go into a home depot show a qr code on my btc wallet and buy some lumber? Or is it some obscure online thing?

Often with merchants accepting BTC payments you need to transact online for obvious reasons. BTC payments need to be encrypted into the blockchain and you can't really do that simply, the only way is to send the transaction and have that completed. You could however in some places pay with BTC to buy gift vouchers, in which case then yeah you could transact via a code...

Though the nature of BTC will always mean you have to transact on the blockchain no matter what it is you buy. Don't get fooled